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[vol-voks] /ˈvɒl vɒks/
any colonial, freshwater green algae of the genus Volvox, forming a hollow, greenish sphere of flagellated cells.
Origin of volvox
1790-1800; < New Latin, equivalent to Latin volv(ere) to turn, roll + -ōx (as in ferōx) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for volvox


any freshwater flagellate protozoan of the genus Volvox, occurring in colonies in the form of hollow multicellular spheres
Word Origin
C18: from New Latin, from Latin volvere to roll
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for volvox

1798, from Latin volvere "to roll," from PIE root *wel- "to turn, revolve," with derivatives referring to curved, enclosing objects (cf. Sanskrit valate "turns round," ulvam "womb, vulva;" Lithuanian valtis "twine, net," apvalus "round;" Old Church Slavonic valiti "roll, welter," vluna "wave;" Greek eluo "wind, wrap," helix "spiral object," eilein "to turn, squeeze;" Gothic walwjan "to roll;" Old English wealwian "roll," weoloc "whelk, spiral-shelled mollusk;" Old High German walzan "to roll, waltz;" Old Irish fulumain "rolling;" Welsh olwyn "wheel").

Online Etymology Dictionary, © 2010 Douglas Harper
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